

That’s some pretty confidently incorrect posting. Most gaming displays these days have some flavor of adaptive sync available that adjusts the refresh rate to the content being displayed, and even before that there were film modes that set the refresh rate to the ~24 fps(or a multiple if it) that film content is at to avoid stuttering/tearing.
This is likely the bottom of the adaptive sync window and will only be used if the machine is idle
That display is using BFI (black frame insertion) which is usually optional to reduce blur.